Miter-cutter



Nb Model.) 2Sheets8h et 1.

'W. R. FOX. MITER CUTTER. No. 476,045. Patented May 31, 1892. 59

(No Model.) r -2 Sheets-Sheet 2. W. R. POX.

' MITBR CUTTER- No. 476,045. Patented May 31, 1892.

UNITED STATES PATENT OFFICE.

WVILLIAM R. FOX, OF GRAND RAPIDS, MICHIGAN.

MlTER-CUTTER.

SPECIFICATION forming part of Letters Patent No. 476,045, dated May 31,1892.

Application filed August 20, 1891. Serial No. 403,256. (No model.)

To aZZ whom it may concern.-

Be it known that I, WILLIAM R. FOX, a citizen of the United States ofAmerica, residing at Grand Rapids, in the county of Kent and State ofMichigan, have invented certain new and useful Improvements inMiter-Cutters, of which the following is a specification.

The class of miter-cutters to which my invention pertains is that inwhich there is a movable wing or gage against which the material is heldin cutting and the inner edge of which is maintained in a plane parallelwith and near the plane in which the edge of the knife moves in thecutting, the inner or front end of the gage being free and supportedlaterally against the pressure of the knife upon a vertical post.

which my invention pertains is shown in Letters Patent of the UnitedStates granted me on the 4th day of December, 1888,N0. 393,970.

In the patent above mentioned, as in other forms of machines heretoforemade by me, the outer or rear end of the gage is supported in a slot bymeans of a set screw or clamp, the slot being part of a circle struckfrom a center at or near the angle formed by' the plane of the post andthe plane of the knife-edge, the slot being sufficiently large to allowfree movement of the gage, but not serving as a guide, the position ofthe supporting or shearing edge of the gage at the front end being inthe machines above referred to and heretofore made determined byconnections at the front end of the gage.

The object of my invention herein set forth is to dispense with theconnections at the front end of the gage, except that of the lateralsupporting-post, and to guide the gage in its various adjustments bymeans of the supporting-post and the slot with its gage connections.

My invention consists in combining with the lateral support to take upthe pressure of the knife at the inner end of the gage witha specialform of curved slot and gage connections therewith, by means of whichthe slot and its gage connections therewith will main tain theshearing-edge of the gage always in the same plane and in the samerelation to the plane of the out.

My invention is illustrated in the accompanying drawings, in which-Figure 1 is a plan View of the cutter-bed, showing the gage inhorizontal section. Fig. 2 is a section on line w a: of Fig. 1. Fig. 3is a plan view illustrating one mode of forming the slot. Fig. 4 is adiagram illustrating the method of laying off the slot.

In the drawings, A represents the bed of the machine, and B the posts.These posts and the gages which bear upon them are ordinarily induplicate; but it is sufficient to describe the mechanism at one endonly.

The gage is shown at A. The shearingedge, or the edge which maintainsits position in the plane parallel with or near the cutting-edge of theknife, is shown at 4, and the edge which bears against face of the postB is shown at 1. These edges are the Vertical corners of the inner endof the gage, which is rectangular in cross-section. The bearingface ofthe post is shown at right angles to the plane in which the knife-edgemoves in cutting. As the knife moves in cutting at this end directlyagainst the wood lying against the face of the gage, the pressure isbrought directly against the bearing-face of the post. The gage is shownin Fig. 1 with its bearing-face for the wood, which is to be cut atright angles to the plane of movement of the knife-edge in full lines.

The dotted lines show the gage in position at various angles less than aright angle. It will be apparent that if a circle for the slot 3 werestruck from the corners 4 in the position shown in full lines and theclamp which holds the rear end of the gage to the slot were closelyfitting the'corner 1 would move away from the bearing-post as the gagewas turned from a right angle, and the front end of the gage would haveno support. On the other hand, if the circle for the slot were struckfrom the point 1 under the same conditions the point 4 would swingforward over the line of cut; but itwill be observed that if the gage beturned from the position shown in fully lines in Fig. 1;, where it is atright angles to the plane of the cut, and supposing the end 4 of thegage to be supported by a plane surface coincident with the plane of thecut or parallel therewith and supported also by the post, the gage beingheld to the post as it turns, the point 4 will slide on itsbearing-surface toward the post until when the gage is brought with itsbearing-face against the plane of the cut the point 4 will be broughtinto contact with the post, and will then occupy the position of thecorner I in the full lines. have devised is one which has its bearingface or facesthat is to say, the edge or edges of the slot-on. a curvethe parts of which are successively equidistant from points success.-ively taken between the extreme bearingpoint 4 and 1 of the corners ofthe gage or bearing-points whenthe gage standsat right angles, as shownin Fig, 1.

To illustrate the formof slot morefully, and also to explain how it maybe made, I refer to. the-diagram shown in Fig. 4. The line 4; y issupposed to indicate the position of the bearing-face of the gage whenit is at right angles to the line of cut. Thecurved slot is shown at S.T indicates the block fitted to move snugly in it, bearing against.

the wallsof theslot. Let the line 4ybe sup.- posed to be six. inches. Itwill indicate the distancebetween the outer end of. the curveandgthepoint 4,, where the shearing-edge c0- incides with theplane onwhich that-point is tobeheld. I then subdivide the-line 4 to 1intoanequal number of partsfor example, ten,.the subdivisions beingindicated by marks aha d, & c. Then I turn the gage, keeping it incontact with the post on. the left-hand side until the corner 4coincides withthepoint a, the first point of the subdivision. of. thebearing-face of the gage six inches from the point a a, will indicate,ther.efore, the margin. of the curve S. In the. same manner I shiftthecorner 4. to the next point I). and in the same manner lay. off theline b b, six. inches in length. Ina similar manner I turn the gage,keeping its right-hand side bearing against the post until Ihaveindicated'acurve long enough to give the re quired sweep tothegageanda-curve drawn throughthe line y a b, &c., to ,z-will indicatethe form of the curve to be made. The curve, if continued to the line 1z, wouldbe at;- the point where it strikes thatline, six inchesdistantfrom the pointl. Practically itis notnecj essary toextend thecurve to thatpoint; but l theslot in practice islaid off onacurve theouter end of whichisthe same distance from apoint where aline on thebearing-face of the-gage at right angles to the line of cut crosses.said. line of: cut, as the point where the inner end ofthe curve crossesthe line of cut is from the point where the plane of the The slottherefore which If Thena. point a, laid off ontheline.

bearing-face of the post crosses the line of the cut, and theintermediate parts of the curve taken from the outer to the inner endare successively equidistant from the point taken in the same order anddegree of succession from. the point where the line of cut crosses theplane of the bearing-face of the post.

In the practical manufacture of my improved gage I mill the curve in thebed by means of the apparatus illustrated in Fig. 3. The bearing-face ofthe post B is finished and a. bearing on: the front is formedtemporarily by means of a bar or plate of steel E,

fixed between the carriage and the gage of .thesame thickness as theknif,e,,so that the face of: it, will be in the, same plane in .whichtheshearing-edge of the gage is to be ,jheld. The-tool consists ofamilling-tool D, :Icarried-i-n an. arm (J, the front end of. which ;isof the same dimensions i'nshori zontal plane ;.as the front end. of thegage. It corresponds in shape to the gage on thesidesand; ends. In therear end. of this bar is the mill- .ing-tool D, which is rotated by anysuitable .imechanisimand. the bar is turned the outer .end moving fromleft to right and the inner T end kept firmly against the postand'thebar .E while the milling-tool is operated; This fcutsthe slotupon the principle and in the form above described. Since this slot andI the connections therein serve not only, to hold the gage inpositionwhenit has been. set in proper position, but also to guide ityto the proper. position. and to maintain the shear- ;ing-corner 4 alwaysinthe plane of" the cut or in aplane parallel therewith,it. is essentialthat the rear-endof the gage be held snugly in the curve. and tothisenda plug Pisprovided, fitted to move snugly in the curve, having a.hole through which the clamp- :screw 0 is inserted, this screw havinganut ,M. on itslower. end to hold the parts-securely in place. Insteadof the plug P being made separate it, may. of. course be made with the.gage, though I prefer the construction shown, asit is. much lessexpensive;,but I do not ',limit myself as to the particular mechanismfor holding the gage snugly in the groove. I have referred to the outer.end of the slot as a line therefrom at right angles to theline of cutwould cross saidline ofv cut; butpracti- .cally the slot is carriedoutward farther to give space for the connections which. hold the gagein the slot;

I claim as my invention-- 1. In a miter-cutting machine,,,a gage havinga free front end and connections forholding it closely ina slotin thebase,.combined with a bearing-post. for. the front end and a basehaving-a curvedslot the partsof'which Lare equidistant. from a shiftingcenter on a :line identical or parallel withthe line of'cut,

substantially as described.

being a certaindistance from the front when 2. In a miter-cuttermachine, a gage, a snpthe front end of the gage, substantially as deport for the front end of said gage against scribed. 10 the thrust ofthe knife, and a curved gnid In testimony whereoflaffix my signature ining-bearing for the outer end of said gage for presence of twowitnesses.

5 maintaining the shearing-edge in aline iden- WILLIAM R. FOX.

tical 01' parallel with the plane bf the out, Witnesses: the parts ofsaid bearing for the outer end JOHN DUFFY,

being equidistant from a shifting center on GEO. DUBRIDGE.

